[net] octeontx2-af: Adjust Tx credits when MCS external bypass is disabled
Commit Message
From: Nithin Dabilpuram <ndabilpuram@marvell.com>
When MCS external bypass is disabled, MCS returns additional
2 credits(32B) for every packet Tx'ed on LMAC. To account for
these extra credits, NIX_AF_TX_LINKX_NORM_CREDIT.CC_MCS_CNT
needs to be configured as otherwise NIX Tx credits would overflow
and will never be returned to idle state credit count
causing issues with credit control and MTU change.
This patch fixes the same by configuring CC_MCS_CNT at probe
time for MCS enabled SoC's
Fixes: bd69476e86fc ("octeontx2-af: cn10k: mcs: Install a default TCAM for normal traffic")
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
---
drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 2 +-
drivers/net/ethernet/marvell/octeontx2/af/mcs.c | 12 ++++++++++++
drivers/net/ethernet/marvell/octeontx2/af/mcs.h | 2 ++
drivers/net/ethernet/marvell/octeontx2/af/rvu.h | 1 +
drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 8 ++++++++
5 files changed, 24 insertions(+), 1 deletion(-)
Comments
On Sun, 2023-07-16 at 14:46 +0530, Geetha sowjanya wrote:
> From: Nithin Dabilpuram <ndabilpuram@marvell.com>
>
> When MCS external bypass is disabled, MCS returns additional
> 2 credits(32B) for every packet Tx'ed on LMAC. To account for
> these extra credits, NIX_AF_TX_LINKX_NORM_CREDIT.CC_MCS_CNT
> needs to be configured as otherwise NIX Tx credits would overflow
> and will never be returned to idle state credit count
> causing issues with credit control and MTU change.
>
> This patch fixes the same by configuring CC_MCS_CNT at probe
> time for MCS enabled SoC's
>
> Fixes: bd69476e86fc ("octeontx2-af: cn10k: mcs: Install a default TCAM for normal traffic")
> Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> Signed-off-by: Geetha sowjanya <gakula@marvell.com>
> Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
> ---
> drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 2 +-
> drivers/net/ethernet/marvell/octeontx2/af/mcs.c | 12 ++++++++++++
> drivers/net/ethernet/marvell/octeontx2/af/mcs.h | 2 ++
> drivers/net/ethernet/marvell/octeontx2/af/rvu.h | 1 +
> drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 8 ++++++++
> 5 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> index eba307eee2b2..d78d72c0ca18 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> @@ -1914,7 +1914,7 @@ struct mcs_hw_info {
> u8 tcam_entries; /* RX/TX Tcam entries per mcs block */
> u8 secy_entries; /* RX/TX SECY entries per mcs block */
> u8 sc_entries; /* RX/TX SC CAM entries per mcs block */
> - u8 sa_entries; /* PN table entries = SA entries */
> + u16 sa_entries; /* PN table entries = SA entries */
This chunk looks like an unrelated bug-fix. Please move it to a
separate patch or mention in the commit message why it's needed here.
Thanks!
Paolo
> -----Original Message-----
> From: Paolo Abeni <pabeni@redhat.com>
> Sent: Tuesday, July 18, 2023 4:39 PM
> To: Geethasowjanya Akula <gakula@marvell.com>; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org
> Cc: kuba@kernel.org; davem@davemloft.net; edumazet@google.com; Sunil
> Kovvuri Goutham <sgoutham@marvell.com>; Subbaraya Sundeep Bhatta
> <sbhatta@marvell.com>; Hariprasad Kelam <hkelam@marvell.com>; Nithin
> Kumar Dabilpuram <ndabilpuram@marvell.com>
> Subject: [EXT] Re: [net PATCH] octeontx2-af: Adjust Tx credits when MCS
> external bypass is disabled
>
> External Email
>
> ----------------------------------------------------------------------
> On Sun, 2023-07-16 at 14:46 +0530, Geetha sowjanya wrote:
> > From: Nithin Dabilpuram <ndabilpuram@marvell.com>
> >
> > When MCS external bypass is disabled, MCS returns additional
> > 2 credits(32B) for every packet Tx'ed on LMAC. To account for these
> > extra credits, NIX_AF_TX_LINKX_NORM_CREDIT.CC_MCS_CNT
> > needs to be configured as otherwise NIX Tx credits would overflow and
> > will never be returned to idle state credit count causing issues with
> > credit control and MTU change.
> >
> > This patch fixes the same by configuring CC_MCS_CNT at probe time for
> > MCS enabled SoC's
> >
> > Fixes: bd69476e86fc ("octeontx2-af: cn10k: mcs: Install a default TCAM
> > for normal traffic")
> > Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> > Signed-off-by: Geetha sowjanya <gakula@marvell.com>
> > Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
> > ---
> > drivers/net/ethernet/marvell/octeontx2/af/mbox.h | 2 +-
> > drivers/net/ethernet/marvell/octeontx2/af/mcs.c | 12 ++++++++++++
> > drivers/net/ethernet/marvell/octeontx2/af/mcs.h | 2 ++
> > drivers/net/ethernet/marvell/octeontx2/af/rvu.h | 1 +
> > drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 8 ++++++++
> > 5 files changed, 24 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > index eba307eee2b2..d78d72c0ca18 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
> > @@ -1914,7 +1914,7 @@ struct mcs_hw_info {
> > u8 tcam_entries; /* RX/TX Tcam entries per mcs block */
> > u8 secy_entries; /* RX/TX SECY entries per mcs block */
> > u8 sc_entries; /* RX/TX SC CAM entries per mcs block */
> > - u8 sa_entries; /* PN table entries = SA entries */
> > + u16 sa_entries; /* PN table entries = SA entries */
>
> This chunk looks like an unrelated bug-fix. Please move it to a separate patch
> or mention in the commit message why it's needed here.
Will submit v2 with updated commit messages.
Thanks,
Geetha.
>
> Thanks!
>
> Paolo
@@ -1914,7 +1914,7 @@ struct mcs_hw_info {
u8 tcam_entries; /* RX/TX Tcam entries per mcs block */
u8 secy_entries; /* RX/TX SECY entries per mcs block */
u8 sc_entries; /* RX/TX SC CAM entries per mcs block */
- u8 sa_entries; /* PN table entries = SA entries */
+ u16 sa_entries; /* PN table entries = SA entries */
u64 rsvd[16];
};
@@ -1219,6 +1219,17 @@ struct mcs *mcs_get_pdata(int mcs_id)
return NULL;
}
+bool is_mcs_bypass(int mcs_id)
+{
+ struct mcs *mcs_dev;
+
+ list_for_each_entry(mcs_dev, &mcs_list, mcs_list) {
+ if (mcs_dev->mcs_id == mcs_id)
+ return mcs_dev->bypass;
+ }
+ return true;
+}
+
void mcs_set_port_cfg(struct mcs *mcs, struct mcs_port_cfg_set_req *req)
{
u64 val = 0;
@@ -1447,6 +1458,7 @@ static void mcs_set_external_bypass(struct mcs *mcs, u8 bypass)
else
val &= ~BIT_ULL(6);
mcs_reg_write(mcs, MCSX_MIL_GLOBAL, val);
+ mcs->bypass = bypass;
}
static void mcs_global_cfg(struct mcs *mcs)
@@ -149,6 +149,7 @@ struct mcs {
u16 num_vec;
void *rvu;
u16 *tx_sa_active;
+ u8 bypass;
};
struct mcs_ops {
@@ -206,6 +207,7 @@ void mcs_get_custom_tag_cfg(struct mcs *mcs, struct mcs_custom_tag_cfg_get_req *
int mcs_alloc_ctrlpktrule(struct rsrc_bmap *rsrc, u16 *pf_map, u16 offset, u16 pcifunc);
int mcs_free_ctrlpktrule(struct mcs *mcs, struct mcs_free_ctrl_pkt_rule_req *req);
int mcs_ctrlpktrule_write(struct mcs *mcs, struct mcs_ctrl_pkt_rule_write_req *req);
+bool is_mcs_bypass(int mcs_id);
/* CN10K-B APIs */
void cn10kb_mcs_set_hw_capabilities(struct mcs *mcs);
@@ -343,6 +343,7 @@ struct nix_hw {
struct nix_txvlan txvlan;
struct nix_ipolicer *ipolicer;
u64 *tx_credits;
+ u64 cc_mcs_cnt;
};
/* RVU block's capabilities or functionality,
@@ -12,6 +12,7 @@
#include "rvu_reg.h"
#include "rvu.h"
#include "npc.h"
+#include "mcs.h"
#include "cgx.h"
#include "lmac_common.h"
#include "rvu_npc_hash.h"
@@ -4371,6 +4372,12 @@ static void nix_link_config(struct rvu *rvu, int blkaddr,
SDP_HW_MAX_FRS << 16 | NIC_HW_MIN_FRS);
}
+ /* Get MCS external bypass status for CN10K-B */
+ if (mcs_get_blkcnt() == 1) {
+ /* Adjust for 2 credits when external bypass is disabled */
+ nix_hw->cc_mcs_cnt = is_mcs_bypass(0) ? 0 : 2;
+ }
+
/* Set credits for Tx links assuming max packet length allowed.
* This will be reconfigured based on MTU set for PF/VF.
*/
@@ -4394,6 +4401,7 @@ static void nix_link_config(struct rvu *rvu, int blkaddr,
tx_credits = (lmac_fifo_len - lmac_max_frs) / 16;
/* Enable credits and set credit pkt count to max allowed */
cfg = (tx_credits << 12) | (0x1FF << 2) | BIT_ULL(1);
+ cfg |= (nix_hw->cc_mcs_cnt << 32);
link = iter + slink;
nix_hw->tx_credits[link] = tx_credits;